Odd voltage reading at start up
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Odd voltage reading at start up
For the last few weeks when I first start my 1989 L98 the voltage reading on the digi-dash is 11.9 to 12.0V. After driving a few blocks it will jump to 14.2V and hold. When this happens it is quick like throwing a switch. My battery is fairly new tests good, and the alternator only has about 3K on it. This always happens and so far always corrects itself.
What could this be? Voltage regulator in the alternator?
What could this be? Voltage regulator in the alternator?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Is the alternator a reman or rebuilt unit? It does sound like the regulator is not working right. Is the serp belt tight??
A voltage reading of 14.1 to 14.3 should be displayed when the engine starts and gradually work down to something like 13.6 to 13.8.
A voltage reading of 14.1 to 14.3 should be displayed when the engine starts and gradually work down to something like 13.6 to 13.8.
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
The alternator is a new built unit by Motor City. Yeah, I think something is amiss with the alternator too. All the connections are good. Everything on the digi dash is working perfectly. Serp belt was replaced with the alternator and is tight. It is like something is delayed or hanging in it's operation. It has a lifetime free replacement warranty. I was hoping not to have to go through the hassle.
